The Core Difference
You reach higher gearing two different ways here. Stretch senior debt is one lender on a first charge advancing to 80 to 85% of cost; mezzanine finance is a second lender filling the gap behind a standard senior loan.
You’re choosing a structure here, not a rate. Stretch senior keeps a single first charge and a single relationship, while mezzanine sits a second-charge lender behind the senior, and the two have to sign an inter-creditor agreement before any drawdown reaches the site. That agreement is the price of gearing past where one lender will go: the stack takes longer to arrange, and the extra rolled-up cost lands on your cash flow rather than the lender’s.
How the Two Structures Stack Up
You push gearing to a similar place by two different routes. Stretch senior tops out around 80 to 85% of loan-to-cost from one facility; mezzanine behind senior reaches 85 to 90% on its second charge.
Your harder limit is the one against end value, not against cost. Stretch senior sits at 70 to 75% of Gross Development Value (GDV), and adding mezzanine lifts combined debt to 80 to 85% of GDV, which thins the room your cash flow keeps for a slow sale. Past 85% of cost stretch senior simply stops, so that extra notch costs you a second charge, and the monitoring surveyor still signs off each stage before the next drawdown clears, now across two charges instead of one.
What Each One Costs
You pay for gearing in two very different shapes. Stretch senior charges one blended rate, around 1.1 to 1.8% a month, across the whole loan; mezzanine keeps the senior rate low on the bulk and prices its own tranche at 1.5 to 3% a month.
You can’t judge either route on its headline rate. The trap is comparing the two as if they applied to the same money. At 1.5 to 3% a month the mezzanine tranche is dear, but it sits on only the top part of the debt, so whether that blend beats one stretched 1.1 to 1.8% rate comes down to the total finance cost against your own margin rather than to which number looks lower. Work both out in pounds over the life of the facility before you choose, because that total is what your cash flow actually pays.
When Stretch Senior Wins
You favour stretch senior when simplicity pays for itself. Stripping out the mezzanine layer removes a whole lender, legal pack and inter-creditor negotiation from the deal.
You’re buying certainty of execution, and it’s worth real money. On a smaller scheme of £1.5m to £3m it is usually worth more than the last few points of gearing: one credit committee meets and clears the facility in a single sitting, one monitoring surveyor runs the drawdowns, the timetable stays predictable, and one facility closes instead of two being stitched together, so the first drawdown reaches your cash flow sooner. On a first deal at this level, that is nearly always the right trade.
When Mezzanine Wins
You reach for mezzanine when you need to push higher or blend cheaper. It fills the gap above where stretch senior stops, to 85 to 90% of cost, and on larger schemes the blended rate can undercut a single stretched rate.
Access matters as much as price above 85% of cost, where mezzanine is often the only route up at all. When no stretch senior lender is active on your scheme type, a mezzanine fund behind a standard senior loan may be the only structure that reaches the gearing you need, and the second charge and inter-creditor agreement come with it. When the rest of the deal looks ready you can still be waiting on two lenders to settle those terms, and every week of that wait is a week your own cash flow is funding the site.
Mezzanine vs Stretch Senior FAQs
What is the difference between mezzanine finance and stretch senior debt?
Stretch senior debt is a single development loan from one lender on a first charge, advancing to around 80 to 85% of cost. Mezzanine finance is a separate second loan that sits behind a standard senior facility on a second charge, filling the gap up to the gearing you need. The core difference is structure: stretch senior is one lender and one charge, while mezzanine adds a second lender and an inter-creditor agreement between the two.
Which gives higher leverage, mezzanine or stretch senior?
Mezzanine typically reaches slightly higher. Stretch senior usually tops out around 80 to 85% of total cost, while a senior loan plus mezzanine can push combined debt to roughly 85 to 90% of cost and 80 to 85% of gross development value. If you need to gear above about 85% of cost, mezzanine is generally the only route, because stretch senior has a practical ceiling.
Is mezzanine or stretch senior cheaper?
It depends on the blend. Stretch senior charges one rate, around 1.1 to 1.8% a month, across the whole facility. Mezzanine keeps the senior rate low on the bulk of the debt but prices its own tranche at roughly 1.5 to 3% a month. On some deals the low senior rate plus a small expensive mezzanine slice beats one stretched rate on everything; on others it loses. Model the total finance cost against your gross margin rather than comparing headline rates.
When should a developer choose stretch senior over mezzanine?
Stretch senior wins when simplicity and speed matter more than squeezing out the last few points of gearing: one lender, one legal pack, one monitoring surveyor and no inter-creditor negotiation. That makes it well suited to smaller schemes and first higher-geared deals. Mezzanine wins when you need to push above about 85% of cost, when the blended cost works out cheaper, or when no stretch senior lender is active on your scheme type or location.
How we compared mezzanine finance and stretch senior debt
What we covered. We compare two routes to higher development gearing in 2026: stretch senior debt from a single first-charge lender, and mezzanine behind a standard senior loan. We set out gearing limits, pricing, charge structure and when each fits.
Data sources. Lending limits, rate and equity ranges were checked against primary sources in July 2026, including specialist lender product pages and the lenders we assess in our development finance reviews and roundup.
How we handle gaps. Where a figure varies by lender, we give the market range rather than a single false-precision number, and we flag that your terms depend on the scheme, the margin and your track record.
Update cadence. We re-verify this page at least monthly, and whenever market pricing moves. The verification date reflects the most recent full review. Some links on this page are affiliate links, see our editorial policy.
Regulatory note. This page is editorial content, not regulated financial advice. Development finance to a limited company or investor is generally unregulated lending, so compare facilities and read the terms before you sign.